What is Lightning Protection System?
A lightning protection system gives lightning current a planned route from the point of attachment on a structure down to ground.
Definition
Purpose
A lightning strike can send a large current through a building in ways the structure was never intended to handle. Roofing, electrical equipment, electronics, and other building systems may be damaged along the path. Lightning protection gives that current a deliberate route through strike termination devices and conductors to ground, reducing the chance of it finding its own path through building components.
Examples of Use
- Commercial Buildings: Systems may be installed across roofs and connected to grounding and building services to reduce lightning-related damage.
- Industrial Facilities: Exposed structures and equipment can be provided with defined paths for carrying lightning current to ground.
- Data and Communication Facilities: Structural lightning protection is often used alongside surge protection where sensitive electronic systems are present.
- Tall or Exposed Structures: Dedicated protection may be specified based on the building's characteristics or the findings of a lightning risk assessment.
Related Terms
Notes
- Lightning rods alone do not make up the full protection system. Conductors, grounding, bonding, and surge protection are also part of the installation.
- NFPA 780 and UL 96A are commonly referenced for lightning protection system design and installation.
- The arrangement is specific to the building. Air-terminal locations, conductor routing, bonding points, and grounding details vary from one project to another.
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